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How much water got in the engine? If the oil is clean and just some residue in the cylinders then start and run the engine. Run it at idle for at least 30 minutes keeping watch of the temperature. As long as you now are getting good fuel through the engine you should be fine. Did you drain the fuel supply module? There is a fuel pump inside and a drain on the bottom. As long as that is full of good fuel any small amount in the lines will be forced out. the engine may be balky to start at first or run rough.
It is a silver tank behind the intake runners. Remove the cowls and the drain screw is on the very bottom.
#7 in the diagram
Let me know if you have any problems.
Which gauge do you have? Did you try pressing the SET or MODE button for 1 second?
Let me know if it worked for you.